Answer:
and 
Step-by-step explanation:
We are given that
be a vector in
.
We have to show that
is orthogonal to v.We have to find the two unit vector orthogonal to the given vector v=(9,40).
Orthogonal vectors:If two vectors u and v are orthogonal then

Using this condition


Hence,
is orthogonal to v.
By using this fact then, we get
(40,-9) is orthogonal to v=(9,40)
Unit vector=


is orthogonal to v=(9,40)


The two unit vectors which are orthogonal to given vector v=(9,40) are given by
and 